When compared to standard colonoscopy, indigo carmine chromoendoscopy, with magnification, has been shown to increase the accuracy for polyp differentiation from 84% to 96% (Fu KI, 2004). High-resolution indigo carmine chromoendoscopy demonstrated a small increase in accuracy over chromoendoscopy without magnification from 81% to 83% . (Hurlstone DP K. M., 2005).